Cutter-grinding device



Sept. 1, 1925; 1,552,001

L. T-.-'MEDHOLDT. ET AL CUTTER" GRINDING DEVICE Fi1ed Feb. 1.4, 1924 2 Sheets-Sheet 'l Sept. 1, 1925. 1,552,001

L. T.. MEDHOLDT'ET AL cu'r'rmi GRINDING DEVICE Filed Feb. 14', 192,4 2 Sheets-Sheet 2 Patented Sept. 1, 1925.

UNITED s ATEs LOUIS T. MEDHOLDT, orjnooxronn, ILLINOI Ann 'LEwIS B, cAR'LsoN, 013' BOSTON,

MASSACHUSETTS, ASSIGNORS T0 S. A. woons MACHINE COMPANY, 0]? s am Bos- TON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS,

CUTTER-GRINDING DEVICE;

Application filed February 14, 1924. Serial No. 692,886.

To aZZw/zom itmag concern: p

I Be it known that we, LOUIS T. MEDHOLDT 'and LEWIS B. CARLsoN, citizens of the United States, and residents, respectively, of Rockford, in the county of Winnebago and State of Illinois, and Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement 1n Cutter-Grinding Devices, of which the following description, in connection'with the accompanying drawings, is a specification, like reference characters on the drawings representing like parts.

Our present invention relatesto, grinding devices, and more particularly to an improved cutter grinding device applicable for grinding cutters while such cutters are 10,-

' cated in operable" position in the 'machine.

In v voodworking machines, and particularly in planing machines, the problem'of keeping cutters sharp and in alignment is a serious one and one that has not been successfully solved.

machines, the cutters are long and are held inoperative position on a'cutterhead that is carried on an arbor and it is necessary that'such cutter be mounted in a cuttertherefore, been made to grind the cutters while such cutters are'in position in the cutterhead and in the machine in which they work. This-was heretofore performed and forth over the cutter'and laterally by a rotating abrasive wheel of emery or carbOI'HIlClUIIl which moved transversely of; the

machine and longitudinally of the cutters." This latter method was successful'in that it reduced the number of settings required for the cutters, but still "necessitated the frequent removal of the cutters fromthe cutterhead in order to reduce the amount of heel that was made by the frequent grindings. As is well known, a planing cutter,

. for example, will not work satisfactorily after the width of the heel of the cutter exceeds a predetermined amount, this amount being approximately 2 As on .certain kinds of wood the cutters wear quite rapidly, it will be obvious that it was nee to frequently remove the cutters from essary the, cutter-head.

That is, in pl n g f gitudinally thereofare slots, 15 which slots isfarrangeda backing plate 16' ,Our. present invention was designed to obviate the necessity of removing cutters from' a cutterhead for the purposeof reducin the amount ofheel thereon and we have, t 'erefore, the cuttersmay' be ground to obtain any desired clearance and removeentirely, if

truin gs or jointings.

devised an improved means-whereby invention, we have utiliz'ed the transverse guideway heretofore built-into, or provided with, planing machine and have so constructed and arranged an'im-proved grinder holding device as to permitthebringi'ng of "the grinding wheel of such cutterv de vices mto any angledesiredWith relation to the cutters so as to obtainanyi clearance of the cutter blades desired during the grind ng operation,

In the accompanying drawings illustrattion,

ing a preferred embodiment of our inven- Fi 1 is a ant elevation;

section Fig 3 is'a detail of a portion of the "grinder holdingdevi'ce;," 7 head in balanced relation to the center of rotation of the cutterhead. 'Attemptshave, i

.Fig. 4 is'a plan view of Fig. 3;

portion of the grinder holding devicepa'nd Fig. 6 is a detail showing the position of a grind-ing wheel with respect to the cutter whereby the heel may be reduced orfentirely eliminated.

portion of the framework "of alplaningj ma-.

. chine on which is mounted, asshown m the dot and dash lines,'.an uprightfor pedestal 11,- one ofthese uprights being located'on either side of the machine. Also mounted on the framework ld and shown in dot*and dash lines by the numeral12 are side mem- [F 1g. -5'isaperspec tive detail of another Fig. 2 is an end elevation, partly in cross Referring to the drawings, lddesignat'es a bers in which are located. alined bearingsfl.

(not shown) and in these bearings is rotatabl'yflmounteda shaft 13' on whichfis secured, in theusual and approved, manner, a'

cutterhead, 14. Gircumferentially arranged about the cutte'rhead 14:, and extending lonand a cutter 17. Cooperating witheac'hgslot in each jof follows, it being assumed that it is desired 7 I to grind cutters 17 so as to remove theheel 51 thereon and to perform this grinding operation while the cutters are held in operative position in the cutterhead 14 and while said cutterhead isin position on the driving shaft of a planer or other machine; The frame '21 with the element 22 thereon is swung about the pivots 20 and'into position relative to the cutterhead 14, as shown in Fig. 2. The shaft 13 is rotated so as to bring one of the cuttersv 17 into operative position with relation to the grinding device. The bolts are now loosened and by grasping the motor 45, the abrasive wheel on the end of the shaft 44 thereof may be moved into a position such, for example, as that shown in Fig. 6 where the entire heel 51 will be removed by the abrasive wheel 47, it being understood, of course, that the screws 31 and 33 are utilized to assist in the positioning of the abrasive wheel 47. After the abrasive wheel has been properly positioned, the bolts 50 are screwed up, thereby clamping the member 43 and motor 45 in proper adjusted po-' sition on the upwardly and outwardly extending cylindrical member 38. Power is turned into the motor 45 and by' grasping the said motor and the member 28, the operator moves the entire device lengthwise on the member 22 and, therefore, longitudinally of the cutter 17. After, one cutter 17 has been properly dressed, the member 25 carrying the motor and abrasive wheel is moved clear of such cutter and the shaft rotated to bring the next succeeding cutter into position where the above operation is repeated, this.

operation being repeated for each of the cutters in the cutterhead.

While we have necessarily shown and described the preferred embodiment of our invention somewhat in detail, it is to be understood that we may vary the size, shape, and arrangement of parts within wide limits without departing from the spirit of the invention.

Having thus described we cl'aim as new is:

1. In a device of the kinddscribedfthe combination of a framework, a transverse slide plate formed integral therewith and at one end thereof, means for pivotally mountour invention, what ing said framework and transverse plate on a machine and permitting the moving of said frame and transverse plate into operative relation with the cutterhead held in such machine, a holding frame slidably mounted on said transverse plate, a cylindrical member extending upwardly and outwardly from said frame, a grinding device, and means for adjustably securing said grindingdevice on said upwardly and outwardly extending cylindrical member. s I

2. In a device of the class described, the combination of a framework, a transverse plate formed integral with, and at one end thereof and lying at an incline to. the per: pendicular, means for pivotally mounting said framework and transverse plate on a machine and permitting movement thereof about the ivot point and into operative. relation to t e cutter blades secured in a cutterhead in the machine, a frame slidably mounted on the transverse plate and capable of sliding movement transversely of the ma extending upwardly and outwardly from,

chine, a cylindrical member formed ;on, and

theframe, a grinding-device, a shaft in said tending cylindrical member and permitting 85 angular adjustment of the grinding shaft.

In witness whereof I hereunto subscribe my name this 23rd day of January, 1924. H

' LEWIS B. 'OARLSON.

In witness whereof I hereunto subscribe" my name this 7th day of Feby., 1924. g

L. T. MEDI-IOLDT. 

